![]() ![]() Head, face and chinĬurve up under and past the pubic symphysis. This is the point when the birth canal curves upward. The baby is still in a antero-posterior position The position at the end of internal rotation when the baby is at the level of At the pelvic outlet, the diameter is widest from front to back Extension Remember: At the pelvic inlet, the diameter of the pelvis is widest from right Will pass through the wides part of the pelvic inlet, which is from right to In the anteroposterior diameter of the outlet. Rotation of the fetal head from occiput transverse to occiput in either anĪs the head reaches the pelvic floor, it rotates so that the sagittal suture is This is when the smallest diameter of the baby’s head presents into the pelvis ![]() This resistance causes flexion of the head (chin to chest). Occurs during descent because of the resistance of the soft tissues in the The widest diameter of the baby’s head is engaged - descent occurs after thisĭuring descent the fetus move downward into the pelvic cavity When the occiput is at the level of the ischial spines, it can be assumed that Movement deep into the pelvic cavity or the downward passage of the presenting Ischial spines (which is also known as fetal station 0) The head is said to be engaged if the leading edge is at the level of the Through the plane of the pelvis/pelvic inlet. EngagementĮntering of the widest diameter, (biparietal diameter - measuring ear tip toĮar tip across the top of the baby’s head), of the fetal presenting part This is when the head is flexed so that the chin is in contact with theĬhest and the posterior fontanel is the presenting part. ItĪccounts for 96% of fetal presentations and will be the one I will be talkingĪbout. Vertex presentation is the most common fetal presentation during labor.
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